Well, we made it back just fine. We had an early start from Singida and had no problems on the way back. We were stopped a few times by police road blocks, but this is just normal. All they are looking for is a way to supplement their meagre salary. It seems many people don't pay their licence or insurance, preferring to pay a little "tea money" to the traffic police is they are stopped.
It was a very good trip and Mbise is a very good traveling companion. Thank you all for your prayers.